Around here I always heard the rear cinch referred to as a Bucking strap because it generates a bucking bronco in horses and I never see it used.
I use a J. T. King Trekker endurance saddle and the rear cinch is only inches away from the front strap so all I would get is a slightly wider cinch strap with two attach points.
I have trouble locating a cinch that is short enough while not being too short.
A 24" cinch works best in neoprene a Pony cinch is too short.
I got the saddle for a 15.3 Racking horse named Hosteen who has since passed he was the best riding horse out of the nine I have had the pleasure of owning, I use it now on the short quarter horses I have, it fits me and them or I'd go for a pure western saddle.